1. preface: 
the purpose of this product specification is to provide technical information for the rechargeable lithium-ion button battery lir2450, manufactured and supplied byshenzhen lidea battery co., ltd.
2. description and model
rechargeable lithium-ion button battery
2.2 model
lir2450
3. specification
3.1 capacity
120±10mah
3.2 charging voltage
4.20v
3.3 nominal voltage
2.75v at 0.2c ma
3.4 standard chargingmethod
constant current: 24maconstant voltage 4.20v
3.5 cut-off discharge voltage
2.75v
3.6 max.discharge current
120ma
3.7 max.charge current
120ma
3.8 cycle life
>500 cycles at 0.2c ma discharge
3.9 ambient temperature
for standard charge
0℃~45℃
for discharge
-20℃~60℃
3.10 storage
for within thetemperature
-20℃~60℃
for within the humidity
≤75%
3.11 energy density
wh/l
wh/kg
3.12 weight of bare cell
~5.6g
3.13 charge state internal impedance
≤400mω
4. appearance
appearance shall be free from any remarkable scratch,flaws, rust, discoloration or electrolyte leakage (visible or bysmell).
5.standard test condition
   5.1 environment conditions: unless otherwise specified,all test stated in this product specificationare conducted within the temperature 15~25℃ and the humidity 45~85%rh.
   5.2 test equipment:
impedance meter: the impedance meter with ac 1khz should be used.
6.test procedure and its standard
item
 measuringprocedure
 standard
6.1 appearance
visual
no defect and leak
6.2 dimension
caliper
as item 8
6.3 weight
scale
as item 3.12
6.4 maximum chargecurrent
cccv(constant current constant voltage)
120ma
6.5 full charge
cc/cv
charge it with 0.2cma constant current till 4.2v(max), thencharge it with constant voltage 4.2v until the charging current drops to 0.01c.
6.6 open circuitvoltage
within 1hr after full charge,measure
open circuit voltage
>4.15v
6.7 internalimpedance
measure the battery with 1khz ac
≤400mω
6.8 dischargecapacity
within 1hr after full charge,discharge until finaldischarge,at 0.2c ma and measure the capacity
>120mah
6.9 maximum dischargecurrent
until final discharge voltage
120ma
6.10 charge/dischargecycle life
discharge:0.2cma to 3.00v, this charge/discharge shall be repeated 500 timescharge:cccv,cc- 0.2cma,cv- 4.2vuntil the cc is below 0.8ma.
discharge capacity should be >70% of item 6.8
6.11 leakageproof
after full charging,thebattery shall be stored at 40±2℃ andhumidity80±5% for 21 days.
no leakage should be
observed by visual
inspection
6.12 temperaturecharacteristics
1) after full charge at 20±5℃, stand at -20±2℃ for 18hrs, then discharge at 0.2c ma and measure the capacity.
2) after full charge at 20±5℃, stand at 55±2℃ for 2hrs, then discharge at 1c ma and measure the capacity. 
discharge capacity should be>60% of item 6.8 and no abnormality onits appearance and structure
6.13 chargeretention
after fullcharging, stand at 20±5℃discharge capacityfor 28 days, measure the discharge should be>85% of item capacityaccording to item 6.8.

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深圳市力电电池科技有限公司
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